The phrase "contained well" is correct and usable in written English.
It can be used to describe something that is effectively held or enclosed within a certain boundary or context.
Example: "The information was contained well within the report, making it easy to understand."
Alternatives: "well encapsulated" or "effectively enclosed".
The extruded blend contained well dispersed, disc-shaped micelles of the diblock.
All of them contained well interconnected ultralarge pores (pores >400 μm) ideal for vascular ingrowth and proliferation of cells.
One month later, all retrieved implants released hARSA at rates similar to unencapsulated cells and contained well preserved myoblasts, demonstrating that encapsulation maintains differentiation of C2C12 cells, stable transgene expression and long-term cell viability in vivo.
The carcass contained well preserved muscular tissue.
Surveys of bottled water in Cleveland and in Iowa found that most contained well below optimal fluoride levels; a survey in São Paulo, Brazil, found large variations of fluoride, with many bottles exceeding recommended limits and disagreeing with their labels.
Feeling my way through The Tender Cut has to go down as possibly the most unsettling 10 minutes of gaming I've ever experienced, and that was with everything contained well and truly within the two-dimensional confines of my laptop screen.
Its three floors contained well-designed and well-conceived exhibits that explained the city's polyglot history and provided insights into Macanese culture.
His fiction list contained well-known names such as Francis King, Michael Arditti, Peter Millar and Edward Wilson; and The Deposition of Father McGreevy by Brian O'Doherty, published by Arcadia after having been turned down by Penguin, was shortlisted for the Booker prize in 2000.
Almost half of the measured samples contained well-identifiable proteinaceous peaks.
The final composite specimens contained well-dispersed and aligned nanofibrils and nanotubes.
Eight of the twelve coprolites analyzed contained well-preserved and rich pollen assemblages.
